This tool is used to prevent the crankshaft rear oil seal from damage when installing it. It is very easy to damage oil seal without using this tool.OEM no.ref: 9990166 88800619Application: VOLVO D13 MASTER SET Use this tool for 7″ Crank Seal 85108352Use this tool AND 88800619 for 7″ Crank Seal 22191895Use this tool, 9998238 or AM-9998238 for 7″ Crank Seal 1543896Use 9998238 or AM-9998238 for 7″ Crank Seal 20441481Use 88800561 or AM-88800561 for 6″ Crank Seal 20441697This is a high-quality aftermarket product. For VOLVO MP7 D11 engine crankshaft seal tool , you need another set alt 88800561 https://www.ebay.com/itm/193354356848